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Net Pension Assets - Summary of Expected Contribution Payments to Defined Benefit Plan (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of defined benefit plans [line items] |  |
Total expected payments | $ 25,619 | $ 21,471
Up to one year [member] |  |
Disclosure of defined benefit plans [line items] |  |
Total expected payments | 3,424 | 2,823
More than one year but less than five years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Total expected payments | 10,794 | 9,195
Over five years [member] |  |
Disclosure of defined benefit plans [line items] |  |
Total expected payments | $ 11,401 | $ 9,453

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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2017-03-09 + Details
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